apfstests/214

#! /bin/sh
# FS QA Test No. 214
#
# Basic unwritten extent sanity checks
#
#-----------------------------------------------------------------------
# Copyright (c) 2009 Red Hat, Inc. All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
#-----------------------------------------------------------------------
#
# creator
owner=sandeen@sandeen.net

seq=`basename $0`
echo "QA output created by $seq"

_cleanup()
{
	cd /
	rm -f $tmp.*
}

here=`pwd`
tmp=$TEST_DIR/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks
. ./common.rc
. ./common.filter

# real QA test starts here
# generic, but xfs_io's fallocate must work
_supported_fs generic
# only Linux supports fallocate
_supported_os Linux

[ -n "$XFS_IO_PROG" ] || _notrun "xfs_io executable not found"

rm -f $seq.full

testio=`$XFS_IO_PROG -F -f -c "falloc 0 1m" $TEST_DIR/$tmp.io 2>&1`

# Old xfs_io doesn't have fallocate support
echo $testio | grep -q "not found" && \
	_notrun "xfs_io fallocate support is missing"
# Old glibc, old kernels, and some filesystems don't have fallocate support
echo $testio | grep -q "Operation not supported" && \
	_notrun "xfs_io fallocate command failed (old kernel? wrong fs?)"

# Ok, off we go.

# Super-trivial; preallocate a region and read it; get 0s.
echo "=== falloc & read  ==="
$XFS_IO_PROG -F -f 		\
	-c 'falloc 0 4096'	\
	-c 'pread -v 0 4096'	\
	$TEST_DIR/ouch | _filter_xfs_io_unique
rm -f $TEST_DIR/ouch

# Preallocate a chunk, write 1 byte, read it all back.
# Should get no stale data.  Early ext4 bug.

echo "=== falloc, write beginning, read ==="
$XFS_IO_PROG -F -f 		\
	-c 'falloc 0 512'	\
	-c 'pwrite 0 1'		\
	-c 'pread -v 0 512'	\
	$TEST_DIR/ouch | _filter_xfs_io_unique
rm -f $TEST_DIR/ouch

# Same but write in the middle of the region
echo "=== falloc, write middle, read ==="
$XFS_IO_PROG -F -f 		\
	-c 'falloc 0 512'	\
	-c 'pwrite 256 1'	\
	-c 'pread -v 0 512'	\
	$TEST_DIR/ouch | _filter_xfs_io_unique
rm -f $TEST_DIR/ouch

# Same but write the end of the region
echo "=== falloc, write end, read ==="
$XFS_IO_PROG -F -f		\
	-c 'falloc 0 512'	\
	-c 'pwrite 511 1'	\
	-c 'pread -v 0 512'	\
	$TEST_DIR/ouch | _filter_xfs_io_unique
rm -f $TEST_DIR/ouch

# Reported by IBM on ext4.
#
# Fixed by commit a41f20716975910d9beb90b7efc61107901492b8
#
# The file was previously preallocated, and then initialized the middle of
# the preallocation area using Direct IO write, then overwrite part of
# initialized area. Later after truncate the file (to the middle of the
# initialized data), the initialized data *before* the new file size was
# gone after remount the filesystem.

echo "=== falloc, write, sync, truncate, read ==="
# Allocate, write, sync, truncate (buffered)
$XFS_IO_PROG -F -f				\
	-c 'falloc         0x0     0x65C00'	\
	-c 'pwrite -S 0xAA 0x12000 0x10000'	\
	-c 'fsync'				\
	-c 'truncate 0x16000'			\
	$TEST_DIR/ouch | _filter_xfs_io_unique

# now do a direct read and see what's on-disk
$XFS_IO_PROG -F -f -d				\
	-c 'pread -v 0 0x16000'			\
	$TEST_DIR/ouch | _filter_xfs_io_unique

rm -f $TEST_DIR/ouch

# success, all done
status=0
exit